大跨度混凝土斜拉桥拆除过程的施工监控  

Construction Monitoring for Demolition Process of Long-span Concrete Cable-stayed Bridge

作　　者：彭玮 范昭 陈晋 杨允表 董书鸣 PENG Wei;FAN Zhao;CHEN Jin;YANG Yunbiao;DONG Shuming

机构地区：[1]上海城投航道建设有限公司,上海市200441 [2]上海市基础工程集团有限公司,上海市200433 [3]上海科路土木工程咨询有限公司,上海市200433

出　　处：《城市道桥与防洪》2022年第7期140-143,共4页Urban Roads Bridges & Flood Control

摘　　要：可供大跨度混凝土斜拉桥拆除施工参考的工程实例不多,其拆除过程的施工监控对整个拆除施工起到重要的指导作用.以上海市泖港大桥老桥中跨200 m的混凝土斜拉桥为工程实例,讨论了老桥拆除施工监控的原则,介绍了施工监控结构分析的主要思路与内容,设计了满足拆桥监控需要的现场监测系统.在老桥拆除过程中,通过斜拉索索力、主塔偏位、主梁位移这些主要控制参数理论值与实测值的比较以及关注主塔与主梁关键截面应力的变化,对拆桥过程的结构安全风险进行了有效的控制,确保了老桥的顺利拆除.As there are few engineering examples referenced for the demolition construction of long-span concrete cable-stayed bridge,the construction monitoring ofits demolition process plays an important guiding role in whole demolition construction Taking the concrete cable-stayed bridge with a middle span of 200 m of the old bridge of Maogang Bridge in Shanghai as an engineering example,the principles of construction monitoring of the old bridge demolition are discussed.The main ideas and contentsof structural analysis for construction monitoring are introduced.An on-site monitoring system is designed to meet the needs of bridge demolition monitoring During demolition of the old bridge,through the comparison between the theoretical and measured values of these main controlling parameters such as the stayed cable force,main pylon deflection and main beam displacement,and paying attention to the changes of stresses in key sections of the main pylon and the main beam,the structural safety risk in demolition process is effectively controlled to ensure the smooth demolition of the old bridge.

关 键 词：大跨度混凝土斜拉桥 老桥拆除 监控原则 位移与应力测点布置 自动化实时监测系统 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]